using Razor.Templating.Core;

var model = new ExampleModel()
{
    PlainText = "This text is rendered from Razor Views using Razor.Templating.Core",
    HtmlContent = "<em>You can use it to generate email content, report generation and so on</em>"
};

// Both ViewBag and ViewData should be added to the same dictionary. 
var viewDataOrViewBag = new Dictionary<string, object>();
// ViewData is same as mvc
viewDataOrViewBag["Value1"] = "1";

// ViewBag.Value2 can be written as below. There's no change on how it's accessed in .cshtml file
viewDataOrViewBag["Value2"] = "2";

var html = await RazorTemplateEngine.RenderAsync("/Views/ExampleView.cshtml", model, viewDataOrViewBag);

var html = await RazorTemplateEngine.RenderPartialAsync("/Views/ExampleView.cshtml", model, viewDataOrViewBag);

...
services.AddTransient<ExampleService>();
//add after registering all the dependencies
services.AddRazorTemplating();

using Microsoft.Extensions.DependencyInjection;

// Add dependencies to the service collection
var services = new ServiceCollection();
services.AddTransient<ExampleService>();
// Add RazorTemplating after registering all dependencies
// this is important for the razor template engine to find the injected services
services.AddRazorTemplating(); 

var html = await RazorTemplateEngine.RenderAsync("~/Views/ExampleViewServiceInjection.cshtml");

public class MyService {
    private readonly IRazorTemplateEngine _razorTemplateEngine;

    public MyService (IRazorTemplateEngine razorTemplateEngine)
    {
        _razorTemplateEngine = razorTemplateEngine;
    }

    public async Task Index()
    {
        var renderedView = await _razorTemplateEngine.RenderAsync("/Views/Home/Index.cshtml");
        // do something with renderedView
    }
}

using Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.FileProviders;
using Razor.Templating.Core;

var services = new ServiceCollection();
services.AddMvcCore().AddRazorRuntimeCompilation();
services.Configure<MvcRazorRuntimeCompilationOptions>(opts =>
{
    opts.FileProviders.Add(new PhysicalFileProvider(@"D:\PathToRazorViews")); // This will be the root path
});
services.AddRazorTemplating();

var html = await RazorTemplateEngine.RenderAsync("/Views/Home/Rcl.cshtml"); // relative path to the root